{"id":"8b0c9d22-7ef7-4b91-9eb3-e42e7705e440","shortId":"3XE7fv","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/transactions/335` is listed as \"Premium API Access\" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys, rate limits, or subscriptions are required — each request is individually settled on-chain.\n\nThe broader platform advertises multiple API categories including Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are uniformly priced at $0.02 per request.\n\nHowever, the specific endpoint probed (`/api/v1/transactions/335`) does not clearly map to any of the documented API categories. Its description is simply \"Premium API Access\" with no further documentation on what data or functionality it returns. The docs, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. Without an OpenAPI schema, request/response examples, or detailed documentation, the actual behavior of this endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["No documentation available — docs, pricing, and README pages all show only 'Connect wallet' with no content.","The endpoint path /api/v1/transactions/335 does not correspond to any of the documented API categories on the landing page.","No OpenAPI schema, request body schema, or response examples are available.","Actual functionality behind 'Premium API Access' is unknown — the description is generic."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/335","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/transactions/335","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no OpenAPI schema, no request/response examples, no documentation beyond a wallet-connect prompt, and the specific endpoint's purpose (\"Premium API Access\" at /api/v1/transactions/335) is unexplained. This is effectively a stub 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'/request':13,28 '0.02':12,27,80,147 '000':74 '20':73 '402':66 '402 payment API' 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,173 'actual':212 'advertis':103 'ai':115 'analysi':119 'analyt':109 'api':5,20,38,61,84,105,165,172 'base':8,23,51,75 'behavior':213 'broader':101 'call':4,19,82 'categori':106,166 'chain':99 'challeng':67 'classif':122 'clear':158 'connect':195 'content':201 'convers':139 'crypto-paid API' 'data':108,112,180 'descript':168 'detail':209 'doc':186 'document':164,177,210 'embed':123 'endpoint':55,142,153,216 'estim':133 'exampl':207 'exchang':128 'export':113 'feed':127 'financ':124 'function':182 'gas':132 'generat':140 'geocod':137 'howev':150 'i.e':79 'includ':107 'individu':95 'infrastructur':135 'insight':114 'json-response' 'key':85 'learn':117 'limit':87 'list':58 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':116 'map':159 'metric':110 'multipl':104 'network':9,24,52 'no-api-key' 'on-chain':97 'openapi':204 'page':190 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,69 'per':3,18,36,81,148 'platform':6,21,39,102 'post-method' 'premium':60,171 'price':126,145,187 'probe':154 'prompt':197 'protocol':44 'quot':131 'rate':86,129 'readm':189 'remain':217 'render':192 'report':111 'request':37,93,149 'request/response':206 'requir':68,91 'return':64,184 'schema':205 'sentiment':118 'settl':96 'simpli':170 'specif':54,152 'subscript':89 'substant':200 'summar':121 'text':120 'token':130 'unclear':218 'uniform':144 'unit':76 'usdc':15,30,47,78 'usdc-base-network' 'use':41 'util':136 'valid':138 'via':10,25 'wallet':196 'web3':125 'without':202 'x402':11,26,43 'x402 API' 'x402-payment'","prices":[{"id":"0abae5f3-fd57-4408-80c5-d8c65df57d11","listingId":"8b0c9d22-7ef7-4b91-9eb3-e42e7705e440","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/transactions/335","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:10.127Z"}],"sources":[{"listingId":"8b0c9d22-7ef7-4b91-9eb3-e42e7705e440","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/335","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:10.127Z","lastSeenAt":"2026-04-23T11:31:27.345Z"}],"details":{"listingId":"8b0c9d22-7ef7-4b91-9eb3-e42e7705e440","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/335 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/335"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/335"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists API categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API access","Programmatic access to various utility and data endpoints without subscriptions"],"bestFor":["Developers who want to pay per request without API key management","AI agents with x402-compatible wallets on Base network","Low-volume or bursty usage patterns where subscriptions are wasteful"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.678Z"},"updatedAt":"2026-04-23T11:31:27.345Z"}}